The Global Volcanism Program has no Weekly Reports available for Bachelor.

The Global Volcanism Program has no Bulletin Reports available for Bachelor.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Synonyms

Bachelor Butte

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Dry Butte

Pyroclastic cone

43° 49' 0" N

121° 39' 0" W

Egan

Pyroclastic cone

2158 m

44° 0' 0" N

121° 41' 0" W

Klak Butte

Pyroclastic cone

43° 52' 0" N

121° 37' 0" W

Kwohl Butte

Shield volcano

2243 m

43° 58' 0" N

121° 41' 0" W

Lolah Butte

Pyroclastic cone

43° 50' 0" N

121° 41' 0" W

Lolo Butte

Pyroclastic cone

43° 51' 0" N

121° 37' 0" W

Lookout Mountain

Shield volcano

1894 m

43° 48' 0" N

121° 42' 0" W

Lumrun Butte

Pyroclastic cone

43° 50' 0" N

121° 41' 0" W

Pistol Butte

Pyroclastic cone

43° 49' 0" N

121° 33' 0" W

Red Crater

Pyroclastic cone

1646 m

43° 57' 0" N

121° 47' 0" W

Sheridan Mountain

Shield volcano

2100 m

43° 54' 0" N

121° 41' 0" W

Siah Butte

Pyroclastic cone

43° 51' 0" N

121° 41' 0" W

Sitkum Butte

Pyroclastic cone

43° 50' 0" N

121° 33' 0" W

Three Trappers

Pyroclastic cone

43° 50' 0" N

121° 41' 0" W

Tot Mountain

Pyroclastic cone

2329 m

43° 57' 0" N

121° 41' 0" W

Wake Butte

Pyroclastic cone

43° 50' 0" N

121° 37' 0" W

Basic Data

Volcano Number

Last Known Eruption

Elevation

LatitudeLongitude

322090

5800 BCE

2763 m / 9063 ft

43.979°N
121.688°W

Volcano Types

Stratovolcano
Shield(s)
Pyroclastic cone(s)

Rock Types

MajorAndesite / Basaltic Andesite
Basalt / Picro-Basalt

Tectonic Setting

Subduction zoneContinental crust (> 25 km)

Population

Within 5 kmWithin 10 kmWithin 30 kmWithin 100 km

18
24
22,514
231,420

Geological Summary

The 25-km-long Mount Bachelor volcanic chain consists of a symmetrical late-Pleistocene to Holocene stratovolcano SE of South Sister volcano and a roughly N-S-trending chain of scoria cones and small shield volcanoes. The youthful basaltic-andesite and basaltic Mount Bachelor volcanic chain was formed in four eruptive episodes dating back to about 18,000-15,000 years before present (BP). Construction of the NNW-SSE scoria cone chain south of Mount Bachelor was completed by about 12,000 years BP. The 2763-m-high Mount Bachelor (formerly known as Bachelor Butte) on the north topographically dominates the chain and is one of its youngest features. The latest activity from the chain produced early Holocene or latest Pleistocene lava flows on the east side of Sparks Lake erupted from scoria cones on the NNE flank and lava flows from Egan scoria cone on the north flank of Mount Bachelor that slightly preceded the eruption of the Mazama ash from Crater Lake about 7700 years ago.

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Williams H, 1957. A geologic map of the Bend Quadrangle, Oregon and a reconnaissance geologic map of the central portion of the High Cascade Mountains. Oregon Dept Geol Min Ind, 1:125,000 and 1:250,000 scale.

Eruptive History

Deformation History

There is no Deformation History data available for Bachelor.

Emission History

There is no Emissions History data available for Bachelor.

Photo Gallery

Mount Bachelor, a symmetrical stratovolcano SW of Bend, Oregon, is seen here from the north with a neoglacial moraine in the center. No known summit eruptions have occurred during the Holocene, although Bachelor was active until the latest Pleistocene and a north flank vent produced a series of lava flows that immediately preceded the eruption of the Mazama ash about 6850 years ago.

Photo by Willie Scott, 1981 (U.S. Geological Survey).

Kwohl Butte cinder cone in the foreground is part of a 25-km-long chain of small shield volcanoes and cinder cones extending north to Mount Bachelor. South and Middle Sister volcanoes are visible to the left behind the furrowed slopes of Mount Bachelor.

Photo by Lee Siebert, 1981 (Smithsonian Institution).

Kwohl Butte cinder cone is one in a 25-km-long chain of cinder cones and small shield volcanoes south of Mount Bachelor in the central Cascade Range of Oregon. Despite the youthful appearance of the cone, geologic mapping indicates construction of the chain was completed about 12,000 years ago

Photo by Lee Siebert, 1981 (Smithsonian Institution).

Mount Bachelor, seen here from the jagged summit of Broken Top volcano to the north, is a symmetrical stratovolcano constructed during the latest Pleistocene. The only known Holocene eruptions were from a cone on the north flank. Mount Bachelor is a major downhill skiing destination of the central Oregon Cascades.

Photo by Lee Siebert, 1982 (Smithsonian Institution).

Mount Bachelor, rising 1000 m above Sparks Lake on the west, is a late Pleistocene-to-Holocene basaltic-andesite stratovolcano at the northern end of a 25-km-long chain of scoria cones and small shield volcanoes. The 2763-m-high symmetrical volcano is the site of a major ski resort SW of Bend, Oregon.

Affiliated Sites

The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the MAGA Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO2 to the atmosphere, but installing CO2 monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere.

WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.

Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.

Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.

EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).